Grade 8 · Science
Distinguish elements, compounds and mixtures
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Example & extra help
Try a sample
A pure sample contains only O2 molecules. Which category fits?
- a compound
- insufficient composition evidence
- a mixture
- an element
See the answer & why
an element
Both atoms in each molecule are oxygen; only one element is present.
A little hint: An element contains one type of atom, even when its atoms occur in molecules.
An element contains one type of atom, even when its atoms occur in molecules.
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